[nginx] Update ECS to 1.12

[marc-gr]

Automated PR.

Updates ECS to v1.12 and does the required changes to the package.

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[elasticmachine]

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• Start Time: 2021-09-23T09:29:25.974+0000

• Duration: 23 min 1 sec

• Commit: 3cc8acb

Test stats 🧪

Test	Results
Failed	0
Passed	40
Skipped	0
Total	40

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